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arXiv 1901.02129cond-mat.mtrl-sci
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用于纵向自旋Seebeck效应的钇铁石榴石/Pt多层膜的制备

Fabrication of yttrium-iron-garnet/Pt multilayers for the longitudinal spin Seebeck effect

Tatsuhiro Nozue, Takashi Kikkawa, Tomoki Watamura, Tomohiko Niizeki, Rafael Ramos, Eiji Saitoh, Hirohiko Murakami

摘要:

对于纵向自旋塞贝克效应(LSSE)器件,期望包括铁磁层和非铁磁层的多层结构来提高它们的热电功率。在本研究中,我们开发了基于室温溅射和$ex$ - $situ$后退火方法在钆镓石榴石(GGG)(110)衬底上交替堆叠的钇铁石榴石(YIG)/Pt多层膜GGG/[YIG(49 nm)/Pt(4 nm)] $_n$($n =$ 1 - 5)的制备方法,并评估了其结构和LSSE性质。所制备的[YIG/Pt] $_n$样品显示出平坦的YIG/Pt界面和几乎相同的饱和磁化强度$M_{\rm s}$,尽管它们在Pt层上包含多晶YIG层以及在GGG上包含单晶YIG层。在样品中,我们观察到清晰的LSSE信号,并发现LSSE热电功率因子(PF)随着$n$的增加而单调增加;与[YIG/Pt] $_1$相比,[YIG/Pt] $_5$样品的PF增强了$\sim 28$倍。这一工作为今后多层LSSE器件的研制提供了指导。

英文摘要:

For longitudinal spin Seebeck effect (LSSE) devices, a multilayer structure comprising ferromagnetic and nonmagnetic layers is expected to improve their thermoelectric power. In this study, we developed the fabrication method for alternately stacked yttrium-iron-garnet (YIG)/Pt multilayer films on a gadolinium gallium garnet (GGG) (110) substrate, GGG/[YIG(49 nm)/Pt(4 nm)]$_n$ ($n =$ 1 - 5) based on room-temperature sputtering and $ex$-$situ$ post-annealing method and we evaluated their structural and LSSE properties. The fabricated [YIG/Pt]$_n$ samples show flat YIG/Pt interfaces and almost identical saturation magnetization $M_{\rm s}$, although they contain polycrystalline YIG layers on Pt layers as well as single-crystalline YIG layers on GGG. In the samples, we observed clear LSSE signals and found that the LSSE thermoelectric power factor (PF) increases monotonically with increasing $n$; the PF of the [YIG/Pt]$_5$ sample is enhanced by a factor of $\sim 28$ compared to that of [YIG/Pt]$_1$. This work may provide a guideline for developing future multilayerbased LSSE devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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